Obviously, and nobody said that. But it would be silly for machine to not implement it when it is possible. And it could have alerted this car to the fire truck even before it came into camera view.
On a real street, a deaf driver would have looked, seen a fire truck and stopped. People who could hear would have slowed even before the intersection.
The other day I avoided getting hit by a car that pulled an illegal u-turn, by yelling it got their attention.
